Storage in confined aquifer: Spectral analysis of groundwater in responses to Earth tides and barometric effect |
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| Authors: | David Ching‐Fang Shih |
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| Institution: | Institute of Nuclear Energy Research, AEC, Taiwan (ROC), Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Taiwan (ROC) |
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| Abstract: | Dilatation of aquifer and associated water level fluctuation in groundwater well is known to be driven periodically from lunar, solar, or other tidal forces. Time‐dependent variables in groundwater system, such as water level, can be converted to power spectra in the frequency domain using Fourier transform to evaluate significant fluctuation. The major innovation of this research is to develop spectral representation in frequency domain for the groundwater system that the storage in confined aquifer can be determined considering dilatation affected by Earth tides and barometric effect. In order to verify applicability of the evolved method, time series of Earth tides and barograph are collected; aquifer storage is then determined inversely by selecting significant semidiurnal and diurnal components in spectra computation. It suggests that to discover groundwater storage using groundwater level with barograph and tidal potential of Earth in frequency domain becomes accessible and feasible. |
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| Keywords: | barometric effect Earth tides groundwater storage spectral analysis |
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